Radius and angle tangent dresser



Filed June 2, 1967 Oct. 28, 1969 R. J. slRols 3474772 RADIUS AND ANGLE TANGENT DRESSER 5 Sheets-Sheet 1 Ruben' J. Sim/'s INVENTOR.

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R. J. slRols RADIUSAND ANGLE TANGENT DREssER ozL'zs, 1989 3 Sheets-Sheet 2 Filed June 2, 1967 Fig 2 Rabat] J. Sim/'s IN VENTOR.

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United States Patent O 3,474,772 RADIUS AND ANGLE TANGENT DRESSER Robert J. Sirois, 8 Ronald Drive, Berlin, Conn. 06037 Filed June 2, 1967, Ser. No. 643,211 Int. Cl. B24b 53/00 U.S. Cl. 125-11 4 Claims ABSTRACT OF THE DISCLOSURE An attachment for a grindng machine which utilizes a diamond mounting upright tool post slidably aflixed to a block for a straight line shifting of the diamond through a rack and pinion drive between the tool post and block. The block is in turn rotatably mounted for a radius forming rotational movement of the dressing diamond with the entire :attachment being selectively mountable upon the way or bed of a grinding machine.

The instant invention is concerned with the dressing of grinding Wheels and the like, and more partcularly relates to a radius and angle tangent dresser which is mountable directly upon the grinding machine for selective engagement with the grinding or cutting tool in :a manner so as to effect the wheel dressing operation, regardlessvof the combination of tangent angles and radii, with a minimum amount of effort on the part of the operator.

It is a primary object of the instant invention to provide a dresser wherein, through a series of simplified settings the attachment can be utilized to form accurate radii on grinding Wheels or the like with accurate tangents on either or both sides of the radii with substantially one continuous movement of the dressing diamond.

Another highly significant object is, in conjunction with the presetting of the attachment for the formation of both a radius and one or two tangents to the side thereof, to provide a dresser wherein the dressing diamond is completely exposed to the view of the operator during the dressing operation whereby a constant visual check can be made of the progress of the dressing operation. i

Furthermore, a significant object of the instant invention resides in the provision of a compact unit which iS portable in nature and easly adapted fo'r' mounting on substantially any type of grinding machine for operative dressing engagement with the grinding tool.

Also, it is an object of the instant invention to provide a dresser wherein both rotation'al and longitudinal movement of the dressing tool can be eifected through a simple manipulation of the components involved.

Likewise, it is an important object'of the instant invention to provide a dressing attachment which is 'of a rugged construction capable of performing the necessary dressing Operations with a minimum amount of maintenance, the attachment itself incorporating adjustment meansf'therein for maintaining a true orientation of the elements involved.

Basically, in achieving the above objects, the dressing attachment of the instant invention includes a mounting base having a socket at one end which rotatably receives the shaft of a mounting block. The mounting block in turn slidably mounts, through a second block, an upright diamond carrying tool post. The tool post block is adjusted relative to the mounting block by a pinion and rack association with the tool post, :and hence the dia'- mond carried thereon, also being 'rotatably movable' through the rotatable mounting of the mounting' block itself on` the mounting base. A gr-aduated'semi-circular dial is provided on the mounting base iu conjunction with a pair of adjustable stops whereby the appropriate settings.

can be eifected for achieving the desired angle tangents. Means is also provided directly on the tool post for use,

3,474,772 Patented Oct. 28, 1969 ice i in conjunction with gauging blocks, in setting the diamond for the desired radius dressing.

These together With other objects and advantages which will become subsequently -apparent reside in the details of construction and operation as more fully hereinafter described and claimed, reference being had to the accompanying drawings forming a part hereof, wherein like n'umerals refer to like parts throughout, and in which:

FIGURE -1 is a perspective view of the attachment of the instant invention mounted, as an example, on a Brown and Sharpe universal tool and cutter grinder;

FIGURE 2 is an enlarged cross-sectional view taken substantially on the plane passing along line 2-2 in FIG- URE 1;

FIGURE 3 is an enlarged cross-sectional detail taken substantially on a plane passing along line 3-3 in FIG- URE 4; i

FIGURE 4 is an exploded perspective view of the various components;

FIGURE 5 is a perspective detail of the manipulating lever utilized in angle tangent forming;

FIGURE 6 is a perspective detail of the bottom of the tool post block;

FIGURE 7 is a group view illustrating examples of dressed configurations achievable through a utilization of the dresser of the instant invention; and

FIGURE 8 is a perspective illustration of the attachment with a dust shield mounted thereon.

Referring now more specifically to the drawings, reference numeral 10 is used to generally indicate the radius and angle tangent dresser, or dressing attachment, of the instant invention. The dresser 10 includes a mounting base 12 which incorporates, at one end thereof, a vertically elongated sleeve-like portion 14 which in turn defines an internal bore or socket 16 within which a suitable tapered bushing 18 is mounted. The lower end portion of the lbushing 18 is in the nature of an externally threaded reduced diameter extension 20` which, interiorly, continues the tapered bore 22 of the bushing 18.

In order to provide for a positioning of the mounting base on the machine 24 with which the grinding Wheel or the like 26 is associated, an integrally formed or cast mounting arm 28 projects radially from the socket defining sleeve portion 14, this arm 28, in the illustrated embodiment, being upwardly offset as at 30 for the accommodation of the carriage or bed of the machine 24 illustrated in FIGURE 1. The outer end of the arm 28 terminates in a downwardly directed V-notch 32 which is received over the peaked upper portion of the elongated carriage supported machine way 34. The way 34 is in` turn fixedly clamped within the notch 32 by means of an underlying foot 36 which has an upwardly directed rod 38 rigid therewith and projecting therefrom through a vertical bore or passage 40 in the arm 28 immediately inward of the way receiving notch 32.

The upper end of the rod 38 is pivotally aflixed within the bifurcated camming member 42 which engages against the upper surface of the arm 28 to either side of the bore 40 and is selectively manipulated, through an elongated handle 44, for eflecting an upward drawing of the shaft 38 in a manner so as to produce a clamping of the machine way 34 between the arm 28 and the underlying foot 36. In this manner, it will be appreciated that a substantially instantaneous mounting or releasing of the dresser 10 is achievable.

With reference to FIGURE 4 in particular, it will be noted that the sleeve portion 14, Where joined by the arm 28, is radially enlarged a substantial amount about slightly more than half of the circumference. This radially enlarged portion incorporates an upwardly directed undercut groove 46 which in turn'slidably receives a pair of'vadjustable stops 48. An arcuate graduated dial 50 is affixed to the radially enlarged portion immediately outward of the slot 46 and divides the upper surface of the sleeve portion 14 into a series of predetermined angular increments from a central point 52 to a pair of opposed 90 points 54. It will be noted that the undercut slot 46 actually extends slightly beyond both 90 marks 54 in order that an alignment and limiting pin 56 associated with each adjustable stop 48 might be properly aligned with the extreme or 90 mark while still retaining a sufiicient length of slot 46 so as to lock the corresponding stop 48 in position.

With reference to the detail of FIGURE 3, it will be noted that each adjustable stop 48 includes a stacked series of blocks 58 which are retained in Vertical alignment by the pin 56 extending through aligned bores and which are selectively expanded vertically away from each other so as to lock within the undercut slot 46 by means of an appropriate setscrew 60. The lowermost blocks 58 are of course laterally enlarged so as to be received within the undercut portion of the slot 46 whereby a Vertical withdrawal of the adjustable stops 48 is precluded and to also provide for a locked engagement with the slot upon an extension of the screw means 60.

The circular mounting 'block 62 overlies and is rotatably mounted on the sleeve portion 14 of the mounting base 12 by means of an integral depending and generally conical shaft 64 seated Within the conical bore 22 of the bushing 18. The shaft 64, at the lower end thereof, terminates in an externally threaded cylindrical portion 66 on which is received a washer 68 and a retaining nut 70 selectively locked into position by suitable lock means such as setscrew 72 so as to rotatably retan the shaft 64 within the bushing 18. The entire lower end of the bushing 18 and shaft 64 is enclosed within an internally threaded sealing cap 74 threadedly mounted on the bushing extension 20. The block 62 includes an upwardly opening laterally elongated chamber 76 and a pair of opposed internal bores or passages 78 and 80. These passages 78 and 80 extend diametrically across the block 62 for the rotatable reception of the shaft 82, this shaft 82 spanning the central portion of the chamber 76 and mounting, therewithin, a pinion gear 84 fixed to the shaft 82. The passage 78 is substantially enlarged relative to the shaft 82 which is in turn coaxially located therein a bushing or bearing element 86 fixed within the passage 78 toward the outer thereof which in turn is located to the rear of the block 62 in general overlying relation to the 0 mark 52 on the dal 50. The bore 80' is, on the contrary, of a size so as to snugly although rotatably receive and act in the manner of a bushing for the forward portion of the shaft 82. The forward portion of the block 62 is stepped rearwardly as at 88 so as to define a right angular seat. The extreme forward tip 90 of the shaft 82, such tip being in the nature of a bearing member, projects forwardly through the Vertical wall of the right angular seat 88 and is resiliently biased to this position by means of a coiled compression spring 92 engaged about the shaft 82 and seating between the bushing 86 and the rear surface of the pinion 84 or an appropriate mounting collar 94 associated with the pinion 84. The rear end of the shaft 82, projecting rearwardly out of the enlarged rear bore 78, includes a laterally projecting manipulating lever or handle 96 secured thereto. The shaft 82, through the handle 96, is rearwardly movable against the biasing force of the spring 92 so as to effect a retraction of the bearing point or tip 90 into the bore 80. Also, rotation of the shaft 82 is effected through an arcuate swinging of the lever or handle 96.

The mounting block 62, rotatable within limits defined by the two stop pins 56 on the adjustable stop units 48, is provided with a rearwardly projecting rigid pointer 98 aflixed to the rear of the block 62 in Vertical alignment below the shaft 82 and Vgenerally coplanar with the base of the block 62. This pointer 98 overlies the undercut slot or groove 46 so as to abut and be limited by the stop pins 56 which project above the upper surface of the sleeve portion of the mounting base 12 and into the rotational path of the pointer 98.

The mounting block `62 is provided, diametrically across the upper surface thereof, with an upwardly projecting laterally enlarged dovetail rib 100. This rib 100 parallels the enlarged internal block chamber 76 which is in fact defined centrally through the dovetail rib 100 as will be readily apparent from FIGURES 2 and 4. This dovetail rib-100 is received in an undercut dovetailed 'groove 102 defined in the undersurface of a superimposed block 104 which might be referred to as the tool post block in that the tool post 106 is rigidly aflixed to the upper surface of the block 104 by a plurality of bolts 108 and at least one alignment dowel 110. The dovetailed groove 102 has an adjustable beveled edged gib 112 defining one longitudinal edge thereof so as to enable slight adjustments in the width of the groove 102 in order that the rib 100 might be snugly received for movement of the superimposed tool post block 104 solely in the desired longitudinal direction Without any lateral looseness or play. The actual adjustment of the gib is effected through a plurality of adjustment screws threaded within internally threaded bores 114 through the rear portion of the block 104 and into abutting engagement with the fiat rear surface of the gib 112. The specific orientation of these bores 114 will be noted in FIGURE 6. The gib 112, after being adjustably positioned, is locked into the adjusted position by means of a series of bolts 116 extending through bores 118 provided through the upper surface of the tool post block 104 to each side of the tool post 106 as will be appreciated from FIGURE 4. It will of course be appreciated that these bores 118 are in fact slightly larger than the shanks of the associated bolts 116 so as to accomodate slight lateral movement during the adjustment of the gib 112 prior to a. fixed clamping of the gib 112 through a tightening of the bolts 116.

Dependng from the block 104 within the dovetailed groove or slot 102 thereacross is a depending longitudinally extending toothed rack 120, the teeth of which mesh with the teeth of the pinion 84 mounted on the shaft 82 whereby, upon a rotation of the shaft 82, a longitudinal movement of the tool post block 104 relative to the mounting block 62 will be effected.

The forward portion of the tool post block 104 is downwardly offset as at 122 so as to provide in effect a Vertical face 124 which abuts against the Vertical face of the right angular stop or offset 88 in the base block 62.

'. The central portion of this Wall 124 is recessed so as to receive an adjustable bearing insert 126. The insert 126 is laterally adjustable by means of a pair of opposed adjusting bolts 128 threaded through the opposed sides of the depending portion 122 and into engagement with the opposite sides of the insert 126. This insert 126 is in turn selctively locked into an adjusted position by means of a pair of lock bolt 130 threadedly en'gaged with the insert 1,26 through the front face of the downwardly enlarged portion 122. The bores 132 for the lock bolts 130 will be noted in FIGURE 4, such bores being slightly enlarged so as to accommodate the limited lateral adjustability of thernsert 126. The insert 126 has a Vertical groove 134 across the inner face thereof, this groove 134 receiving and accurately locatng the bearing tip of the shaft 82 in its forwardly projecting orientation. The adjustability of this insert 126 is particularly significant in that it provides a means for rectifying any misalignments between the Operating tool or grindin'g diamond 136 and the dilal reading pointer 98 on the lower mounting block 62. As will be appreciated, when an actual movement of the tool post block 104 relative to the mounting block 62 is to be effective through the pinion 84 and rack 120, a retraction of the tip 90 will be necessary, such being easily etfected through a rearward drawing of the handle or leVer 96 prior to a rotational movement thereof.

The tool post 196, as noted previously, is rigidly bolted to the block 104 for adjustment therewith, this tool post 106 curving slightly rearwardly so as to position the vertical upper portion thereof rearward of the Vertical axis of rotation of the shaft 64 of the mountng block 60. This in turn enables an orientation of the grinding diamond 136 either forward or rearward relative to the axis of rotation which in turn enables the formation of either concave or convex surfaces. The diamond 136 is mounted on an elongated holder 138 which projects through the post 106 toward the upper end thereof, for longitudinal adjustment therein, an easily manipulated headed lock screw 140 being threaded perpendicularly into the post 106 for selective introduction into the bore 142 which receives the diamond holder 138 for a locking of the holder 138 therein in an adjusted position. Also slidably received through the post 106 in vertically spaced parallel relation above the holder 138 is a diamond locating rod 144 having a laterally directed head 146 on the forward end thereof and an abutment or manipulating' head 148 on the opposite end thereof. The locating rod 144 is fixed in any longitudinally adjusted position by means of an enlarged headed set screw 150 threaded through the top of the post 106 and into selective looking engagement with the bore received rod 144. The bores which receive the holder 138 and the rod 144 can, if so desred, be provided with sleeve bushings so as to facilitate the adjustrnent of the members.

The rod 144 and head 146 at one end thereof are utilized in effecting a proper location of the dressing diamond 136. This is achieved by initially ascertaining the particular radius desred, loosening the setscrew 150, and utilizing an appropriate gauge block between the rear face of the post 106 and the forward face of the rod manipulating head 148. Once the rod 144 is longitudinally adjusted, the rod is locked into position -by the setscrew 150 with the head 146 depending downwardly therefrom into the path of the holder 138 which is in turn longitudinally adjusted so as to engage the dressing diamond 136 against the inner face of the laterally projecting head 146, thereby properly locating the needle 136. At this point, the holder setscrew 140 is tightened, the rod setscrew 150 released and the rod 144 retracted to the position indicated in phantom lines in FIGURE 2 with the positioninlg head 146 projecting upwardly from the path of the diamond, after which the rod 144 is again locked in position by the setscrew 150. While presized gauging blocks will preferably be utilized in orientating the diamond locating head 146, it will also be appreciated that other types of gauging or measuring devices can be utilized.

Once the diamond 136 is set so as to dress the wheel 26 to the desired radius, either concave or convex, the diamond 136 need merely be brought into engagement with the driven wheel 26 and the diamond 136, in conjunction with the shaft interlocked blocks 104 and 62; oscillated across the face of the wheel 26, the limits of the oscillation being, if deemed advisable, set through a location of the stop units 48. Once the pointer 90 engages one of the stop pins 56, it becomes a simple matter to dress an angle tangent on the wheel 26, this being elfected by merely grasping the handle 96, exerting a slight rearward pull thereon so as to disengage the tip 90, and subsequently arcuately oscillating the handle 96 which will effect, through the engaged pinion 84 and rack 120, a linear movement of the dressing diamond 136 at an angle corresponding to that indicated by the stop pin 56. It will be appreciated that the rearward movement of the shaft 82 suflicient so as to disengage the tip 90 from the insert groove 134 is relatively slight and will not effect the engagement between the pinion l84 and the rack 120. Suitable stop means may of course be provided so as to limit the rearward retraction of the shaft 82.

Referring specifically to the upper illustration in FIG- URE 7, such consttutes one configuration including a central convex radius bounded by two different angle tangents which can be continuously formed. In doing so, the diamond is orientated, through the locating member 144,

146, so as to form the desired centrally located radius, while the two stop units 48 are so orientated as to define the opposite rotational limits of the mountng block 62, and hence dressing diamond 136, to the desired angles. Thus, during the dressing operation, the diamond 136 is oscillated between the two extreme positions set by the stop units 48, the swinging movement being limited by engagement of the pointer 98 against the two stop pins 56, with the diamond 136, at each extreme of the rotational movement thereof, being moved along the linear path defined by the angle at which the corresponding stop unit 48 is set. This latter movement is effected by merely a rearward movement of the handle 96 so as to disengage the bearing tip 90, and a subsequent swinging of the handle 96 from side to side so as to, through the pinion and rack, effect the longitudinal movement of the diamond 136 across the edge face of the particular wheel 26 being dressed. The actual swinging of the diamond 136 during the radius dressing operation can also be ef- -fected through a grasping of the handle 96 without an initial rearward drawing thereof, thus -further simplifying the dressing operation.

In the lower illustration in FIGURE 7, the diamond will have been set so as to define a concave radius, this involving a positioning of the diamond forward of the Vertical axis of rotation, also utilizing appropriate presized gauge blocks. The horizontal portions of this illustration can be pressed through a centering of the pointer on the 0 mark and a movement of the entire carriage of the machine 24 upon which the dresser 10 is mounted with the final opposed angle tangents being defined through a rotation of the mountng block 62 to the appropriate angle, preferably set by a location of the corresponding stop pin 56, after which the handle 196 is rearwardly drawn and laterally manipulated. The phantom line portions in the lower illustration in FIGURE 7 suggest -further angle tangents which can subsequently be defined through a resetting of the stop units 48. During the entire dressing operation, it will be appreciated that the dressing diamond 136 is always clearly visible to the operator.

Referring specifically to FIGURE 8, it will be noted that the dresser 10 has been illustrated as incorporating a dust shield 152 affixed to the upper surface of the tool post block 104 about the forward portion so as to underlie the grinding operation and receive and contain the dust produced thereby. This shield 152 will preferably be of a suitable flexbly resilient rubber or plastic mateerial so as to allow it to be flexed downwardly to a depending out-of-the-way position should such be necessary -for any specific purpose.

As noted previously, the locked orientation between the tool post block 104 and the mountng block `62, can be varied slightly through an adjustrnent of `the insert 126, thereby providing means for achieving and maintaining an extremely high degree of accuracy With regard to the orientation and path of movement of the dressing diamond 136 as guided by the base mounted dial 50.

The foregoing is considered as illustrative only of the principles of the invention. Further, since numerous modifications and changes will readily occur to those skilled in the art, it is not desired to limit the invention to the exact construction and operation shown and described, and accordingly all suitable modifications and equivalents may be resorted to, falling within the scope of the invention as claimed.

What is claimed is as follows:

1. A vertically orientated radius and angle tangent dresser including a mountng base, said mountng base being generally horizontally orientated and comprising a vertically elongated sleeve-like portion at one end thereof and a laterally extending rigid mountng arm integral at one end thereof with the upper end of the sleeve-like portion, the second end of said mountng arm having a downwardly directed notch -formed transversely across the under surface thereof for engagement over the way of a grinding machine, a vertically elongated rod extending slidably through said mounting arm inward of the way engaging second end thereof, a laterally directed foot rigid with the lower end of the rod and selectively positionable beneath a notch received machine way, the upper end of said rod extending above the upper surface of the mounting arm and pivotally engaging a vertically orientated cam member, said cam member having an outwardly directed manipulating handle thereon whereby upon a manipulation of the cam through the handle, an upward drawing of the rod mounted foot can be effected so as to lock a notch received machine way within the arm notch, and hence mount the mounting base, a mounting block positioned over the sleeve-like portion of the mounting base, a vertically elongated shaft integral With and depending from said mounting block into rotatably received reception within the elongated sleevelike portion whereby a selective rotation of the mounting block relative to the mounting base can be eflected, an arcuate dial on the upper surface of said mounting base about at least a 180 portion of the mounting block, pointer means affixed to said mounting block and projecting outwardly therefrom in overlying relation to said dial, and adjustable stop means positionable about the upper surface of said mounting base along said dial, said pointed means being so oriented relative to said stop means as to engage thereagainst whereby said stop means are utilized so as to define the rotational limits of the mounting block relative to the mounting base, the upper surface of said mounting block including an upwardly directed dovetailed rib diametrically thereacross, a tool post block overlying the mounting block and including a downwardly directed dovetail groove diametrically thereacross slidably receiving the dovetailed rib, a tool post aflixed to the tool post block and projecting vertically therefrom, and a horizontally orientated tool adjustably mounted on the tool post, and locking means engaged between the mounting block and the tool post block for both a selective locking of the tool post block to the mounting block for rotation therewith and a selective release of the tool post block from the mounting block for linear sliding movement relative thereto, said locking means including an elongated shaft rotatably mounted within and extending diametrically across said mounting block, transversely of the dovetail rib thereon, one end of said shaft projecting beyond the outer periphery of the mounting block at a portion thereof considered the rear of the mounting block, the front of the mounting block having a recess defined thereacross, the second end of said locking means shaft terminating lwithin said recess, said locking means shaft being selectively retractable so as to withdraw the recess received second end thereof, the forward end of the tool post block overlying the mounting block recess including a depending portion thereon received within the mounting block recess, said tool post block depending portion including a portion receiving the projecting second end of the locking means shaft and retaining said shaft against lateral movement whereby rotational movement of the tool post block relative to the shaft mounting block is precluded prior to a withdrawal of the second end from the mounting block recess, intermeshed gear means on said locking means shaft and the tool post block for effecting a linear movement of the tool post block relative to the mounting block upon a retraction of the second end of the locking means shaft and a rotation of the locking means shaft, the shaft gear means being located within a peripherally enclosed upwardly opening elongated chamber within the dovetailed rib on the mounting block, the tool post block gear means being affixed within the corresponding dovetailed groove and depending into the mounting block Chamber, the first end of said locking means shaft having an elongated handle afiixed at one end thereto and projecting vertically therefrom whereby both a longitudinal and a rotational manipulation of the locking means shaft can be easily effected.

2. The apparatus of claim 1 wherein the portion re- -ceiving the second end of the locking means shaft comprises a vertically elongated groove within an independent insert in the depending portion of the tool post block, said Vertical groove being of a width so as to preclude lateral movement of the second end of the locking means shaft when received therein, and means for laterally adjusting the insert and fixng the insert in an adjusted position whereby correcting adjustments can be made in the locked position of the tool post block, and hence the tool post and tool, relative to the mounting block.

3. The apparatus of claim 2 wherein the mounting base arm is upwardly offset relative to the upper end of the sleeve-like portion.

4. The apparatus of claim 3 including a fiexible shield afifixed to the upper surface of the tool post block about the periphery thereof to the sides and forward of the tool post, said shield selectively extending upwardly in a dust receiving and containing orientation, and downwardly in a depending position.

References Cited UNITED STATES PATENTS 1,994,386 3/1935 Dardani 11 2,336,758 12/1943 Statia 125-11 2,442,453 '6/1948 Bley 125-11 2,853,994 9/1958 Ronches 125-11 HAROLD D. WHITEHEAD, Primary Exarniner 

